高铁列车通过高架桥桩基础激发地震波响应分析  

Analysis of the responses of seismic waves excited by the pile foundations of the viaduct when the high-speed trains passage

作　　者：王之洋 陈朝蒲 白文磊 李幼铭[2,3,4] WANG ZhiYang;CHEN ChaoPu;BAI WenLei;LI YouMing(College of Information Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China;Key Laboratory of Petroleum Resource Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;The Joint Research Group of Asymmetric Elastic Wave Equations,Beijing 100029,China;The Joint Research Group of High-Speed Rail Seismology,Beijing 100029,China)

机构地区：[1]北京化工大学,信息科学与技术学院,北京100029 [2]中国科学院地质与地球物理研究所,中国科学院油气资源研究重点实验室,北京100029 [3]非对称性弹性波动方程联合研究组,北京100029 [4]高铁地震学联合研究组,北京100029

出　　处：《地球物理学报》2022年第7期2622-2635,共14页Chinese Journal of Geophysics

基　　金：国家科技部重大科学仪器设备开发专项重点研发项目(2018YFF01013503);国家自然科学基金联合基金(U20B2014);国家自然科学基金重点项目(41630319)共同资助。

摘　　要：当高铁列车行驶通过高架桥时,其激发和传播地震波的机制与行驶在地面上时的高铁列车是不同的,同时,高铁地震波的波传播机制也因地面条件而异.本文结合前期工作,研究高铁列车行驶通过高架桥(高架桥系统)时高铁地震波的激发机制,给出改进的震源时间函数,并对非对称性弹性波动方程下的合成高铁地震记录的响应特征和影响因素进行研究,以更好地利用高铁列车这一可重复的移动震源进行浅层地质构造成像和反演以及开展工程防护研究.本文应用非对称性弹性波动方程进行高铁地震波数值模拟,结合高铁实际数据,研究分析高铁列车运行速度,地层微孔缝隙特征尺度参数,检波器位置,震源类型,深度衰减系数等多种因素对合成高铁地震记录的影响,给出以下结论:(1)高铁列车运行速度的增大将使得合成地震记录的持续时间减小,振幅能量增强,同时幅频响应的能量逐渐集中在3 Hz、10 Hz和30 Hz附近.(2)地层微孔缝隙特征尺度参数的增大将使得合成地震记录出现衰减,且主要影响20 Hz以上的频率成分.(3)岩土介质对高铁地震波传播的影响显著.(4)高铁地震波以“分级点火”的形式激发,使用Ricker子波作为震源所得的合成地震记录与实际数据匹配较好.(5)随着震源衰减的增大,将使得合成地震记录出现全频带的衰减.The mechanism of seismic waves excitation and propagation by the high-speed train(HST)is quite different when the HST passage over the ground and viaducts,at the same time,the seismic waves propagation mechanism by the HST also vary as per the ground conditions.In order to take advantage of the HST as a repeatable moving seismic source to achieve structural imaging and inversion of shallow surface geological structures,the authors derive the improved source time function by investigating the excitation mechanism of the seismic waves under the HST passage over the viaduct(viaduct system),and analyze the characteristics and influencing factors of the responses of synthetic high-speed rail seismograms which generated by the asymmetric elastic wave equations.In this paper,the asymmetric elastic wave equations are applied to numerical modelling for high-speed rail seismic waves,and compared with the field data,we investigate the influence of various factors on the synthetic high-speed rail seismograms,such as the running speed,the characteristic scales of the micropore of ground,the position of receiver,the source type and the attenuation coefficients on the source,and draw some conclusions:(1)When the running speed of the HST increases,the duration of the responses decreases and the amplitudes increase,at the same time,the spectral energy of the responses are gradually concentrated to around the 3 Hz,10 Hz and 30 Hz.(2)The characteristic length scale of the micropore of ground can affect the responses of high-speed rail seismic waves.The synthetic seismograms and the corresponding Fourier spectra above 20 Hz have apparent attenuation with increasing characteristic scale.(3)The rock and soil medium will significantly affect the propagation of high-speed rail seismic waves.(4)The high-speed rail seismic waves are excited in the form of staged ignition and the synthetic seismograms generated by using the Ricker wavelet as source type have a greater correlation with the field data.(5)As the degrees of the source attenuat

关 键 词：高铁列车 高铁地震波 数值模拟 非对称性弹性波动方程 响应分析 

分 类 号：P631[天文地球—地质矿产勘探]